<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/Home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <!-- 头部警告区域 -->
              <el-alert
                title="注意：只允许为第三级分类设置相关参数！"
                type="warning"  effect="dark" :closable="false" show-icon>
            </el-alert>
            <!-- 级联选择框 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <el-cascader
                        v-model="selectedCateKeys"
                        :options="catelist"
                        :props="cateProps"
                        @change="changeCascader"
                    >
                    </el-cascader>
                </el-col>
            </el-row>
            <!-- tabs标签页 -->
              <el-tabs v-model="activeTabName" @tab-click="handleTabClick" type="border-card">
                  <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button @click="addDialogVisible = true" type="primary" size="mini" :disabled="isBtnDisabled">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column  type="expand">
                            <template slot-scope="scope">
                                <el-tag :key="item.attr_id" v-for="(item,i) in scope.row.attr_vals" 
                                closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column label="#" type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template  slot-scope="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete"  @click="deletePramas(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                  <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button @click="addDialogVisible = true" type="primary" size="mini" :disabled="isBtnDisabled">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData">
                        <!-- 展开行 -->
                        <el-table-column  type="expand">
                            <template slot-scope="scope">
                                <el-tag :key="item.attr_id" v-for="(item,i) in scope.row.attr_vals" 
                                closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column label="#" type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete"  @click="deletePramas(scope.row.attr_id)">删除</el-button>  
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加动态参数与静态属性 -->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed"
            >
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addPramas">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改动态参数与静态属性 -->
        <el-dialog
            :title="'修改'+titleText"
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClosed"
            >
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editPramas">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        data(){
            return {
                //商品分类列表
                catelist:[],
                //级联选择框的基础配置信息
                cateProps:{
                    expandTrigger: 'hover',
                    label:'cat_name',
                    value:'cat_id',
                    children:'children'
                },
                //级联选择框双向绑定的数组
                selectedCateKeys:[],
                //被激活的页签名称
                activeTabName:'many',
                //动态参数数据
                manyTableData:[],
                //静态属性数据
                onlyTableData:[],
                //添加参数对话框的显示与隐藏
                addDialogVisible:false,
                //添加表单的数据对象
                addForm:{
                   attr_name:"" 
                },
                //添加表单的验证规则对象
                addFormRules:{
                    attr_name:[
                        {required:true,message:"参数不能为空",tigger:'blur'}
                    ]
                },
                //控制修改对话框的显示与隐藏
                editDialogVisible:false,
                //修改表单的数据对象
                editForm:{},
                //修改对话框的验证规则对象
                editFormRules:{
                    attr_name:[
                        {required:true,message:"参数不能为空",tigger:'blur'}
                    ]
                },
                //控制输入框与按钮的切换
                inputVisible:false,
                //文本框value的数据绑定
                inputValue:'',
            }
        },
        created(){
            this.getCateList()
        },
        methods:{
            //获取所有商品分类的数据列表
            async getCateList(){
                const {data:res}=await this.$http.get('categories')
                if(res.meta.status!==200) return this.$message.error('获取商品分类列表失败')
                this.catelist=res.data
            },
            //获取静态属性和动态参数
            async getParmamsList(){
                    //根据所选分类的id和当前所处的面板，获取对应的参数
                var {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeTabName}})
                if(res.meta.status!==200) return  this.$message.error('获取商品参数失败，请选择商品分类')
                console.log(res.data);
                // 循环res.data数组
                res.data.forEach(item=>{
                    item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
                    //控制输入框的显示隐藏
                    item.inputVisible=false
                    //每个数据的输入框绑定
                    item.inputValue=''
                })
                console.log(res.data);
                if(this.activeTabName==="many"){
                    // this.$message.success('获取商品动态参数成功')
                    this.manyTableData=res.data
                }else{
                    // this.$message.success('获取商品静态属性成功')
                    this.onlyTableData=res.data
                }
            },
            //级联选择框变化事件函数
            async changeCascader(){
                //证明选中的不是三级分类
                if(this.selectedCateKeys.length!==3){
                    this.selectedCateKeys=[]
                    this.manyTableData=[]
                    this.onlyTableData=[]
                    return 
                }
                //证明选中的是三级分类
                this.getParmamsList()
            },
            //切换tabs页触发的事件
            handleTabClick(){
                this.getParmamsList()
            },
            //关闭添加对话框事件
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            //点击按钮添加参数
            addPramas(){
                this.$refs.addFormRef.validate(async valid=>{
                    if(!valid) return
                    var params={attr_name:this.addForm.attr_name,attr_sel:this.activeTabName}
                    const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,params)
                     if(res.meta.status!==201) return this.$message.error('添加商品参数失败')
                     this.getParmamsList()
                     this.$message.success('添加商品参数成功')
                     this.addDialogVisible=false
                })
            },
            //编辑按钮弹出编辑对话框
            async showEditDialog(id){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${id}`,{params:{attr_sel:this.activeTabName}})
                if(res.meta.status!==200) return this.$message.error('查询参数失败')
                console.log(res.data);
                this.editForm=res.data
                this. editDialogVisible=true
            },
            //关闭修改对话框事件
            editDialogClosed(){
                //重置修改的表单
                this.$refs.editFormRef.resetFields()
            },
            //点击按钮修改参数信息
            editPramas(){
                this.$refs.editFormRef.validate(async valid=>{
                    if(!valid) return 
                    var editForm=this.editForm
                    var params={attr_name:editForm.attr_name,attr_sel:editForm.attr_sel}
                    const {data:res}=await this.$http.put(`categories/${editForm.cat_id}/attributes/${editForm.attr_id}`,params)
                    if(res.meta.status!==200) return this.$message.error('修改参数失败')
                    this.getParmamsList()
                    this.$message.success('修改参数成功')
                    this.editDialogVisible=false
                })
            },
            //删除参数
            async deletePramas(attr_id){
                const confirmResult=await this.$confirm(`此操作将永久删除该${this.titleText}, 是否继续?`, '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err=>err)
                if(confirmResult!=='confirm') return this.$message.info('已取消该次删除操作')
                const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
                if(res.meta.status!==200) return this.$message.error('删除参数失败')
                this.$message.success('删除参数成功')
                this.getParmamsList()
            },
            //失去焦点和按下enter建都会触发的事件
            async handleInputConfirm(row){
                if(row.inputValue.trim().length===0){
                    row.inputValue=''
                    row.inputVisible=false
                    return
                }
                //如果没有return证明用户输入了内容需要做后续处理
                row.attr_vals.push(row.inputValue)
                row.inputValue=''
                row.inputVisible=false
                //将数据保存到后台中
                this.saveAttrVals(row)
            },
            //将用户操作row.attr_vals状态保存到数据库中
            async saveAttrVals(row){
                //将数据保存到后台中
                var params={attr_name:row.attr_name,attr_sel:row.attr_sel,attr_vals:row.attr_vals.join(' ')}
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,params)
                if(res.meta.status!==200) return this.$message.error('修改参数失败')
                this.$message.success('修改参数成功')
            },
            //点击按钮触发的事件
            showInput(row){
                row.inputVisible=true
                // $nextTick函数的作用当页面上的元素重新被渲染的时候
                // 才会执行回调函数里的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                });
            },
            //点击删除tag
            handleClose(i,row){
                console.log(i);
                row.attr_vals.splice(i,1)
                this.saveAttrVals(row)
            }
        },
        computed:{
            //如果按钮需要被禁用就返回true,否则返回false
            isBtnDisabled(){
                if(this.selectedCateKeys.length!==3){
                    return true
                }else{
                    return false
                }
            },
            //这是当前选中的三级分类id
            cateId(){
                if(this.selectedCateKeys.length===3){
                    return this.selectedCateKeys[2]
                }
                return null
            },
            //动态计算标题的文本
            titleText(){
                if(this.activeTabName==="many"){
                    return '动态参数'
                }else{
                    return '静态属性'
                }
            }
        }
    }
</script>

<style lang="less" scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag{
        margin: 15px;
    }
    .input-new-tag{
        width: 150px;
    }
</style>